Kedleston Hall is an English country house in Kedleston, Derbyshire, approximately four miles north-west of Derby, and is the seat of the Curzon family whose name originates in Notre-Dame-de-Courson in Normandy. Today it is a National Trust property. The Curzon family have owned the estate at Kedleston since at least 1297 and have lived in a succession of manor houses near to or on the site of the present Kedleston Hall. The present house was commissioned by Sir Nathaniel Curzon (later 1st Baron Scarsdale) in 1759. The house was designed by the Palladian architects James Paine and Matthew Brettingham and was loosely based on an original plan by Andrea Palladio for the never-built Villa Mocenigo. At the time a relatively unknown architect, Robert Adam was designing some garden temples to enhance the landscape of the park; Curzon was so impressed with Adam's designs, that Adam was quickly put in charge of the construction of the new mansion.

External design The design of the three-floored house is of three blocks linked by two segmentally curved corridors. The ground floor is rusticated, while the upper floors are of smooth dressed stone. The central, largest block contains the state rooms and was intended for use only when there were important guests in the house. The East block was a self-contained country house in its own right containing all the rooms for the family's private use, and the identical West block contained the kitchens and all other domestic rooms and staff accommodation. Plans for two more pavilions (as the two smaller blocks are known) of identical size, and similar appearance were not executed. These further wings were intended to contain, in the south east a music room, and south west a conservatory and chapel. Externally these latter pavilions would have differed from their northern counterparts by large glazed Serlian windows on the piano nobile of their southern facades. Here the blocks were to appear as of two floors only; a mezzanine was to have been disguised in the north of the music room block. The linking galleries here were also to contain larger windows, than on the north, and niches containing classical statuary. If the great north front, approximately 107 metres in length, is Palladian in character, dominated by the massive, six-columned Corinthian portico, then the south front ( illustrated right) is pure Robert Adam. It is divided into three distinct sets of bays, the central section is a four-columned, blind triumphal arch (based on the Arch of Constantine in Rome) containing one large, pedimented glass door reached from the rusticated ground floor by an external, curved double staircase. Above the door, at second floor height, are stone garlands and medallions in relief. The four Corinthian columns are topped by classical statues. This whole centre section of the facade is crowned by a low dome visible only from a distance. Flanking the central section are two identical wings on three floors, each three windows wide, the windows of the first-floor piano nobile being the tallest. Adam's design for this facade contains huge "movement" and has a delicate almost fragile quality.

Interior The neoclassical interior of the house was designed by Adam to be no less impressive than the exterior. Entering the house through the great north portico on the piano nobile, one is confronted by the marble hall designed to suggest the open courtyard or atrium of a Roman villa. Twenty fluted alabaster columns with Corinthian capitals support the heavily decorated, high-coved cornice. Niches in the walls contain classical statuary; above the niches are grisaille panels. The floor is of inlaid Italian marble. Matthew Paine's original designs for this room intended for it to be lit by conventional windows at the northern end, but Adam, warming to the Roman theme, did away with the distracting windows and lit the whole from the roof through innovative glass skylights. If the hall was the atrium of the villa, then the adjoining saloon was to be the vestibulum. The saloon, contained behind the triumphal arch of the south front, like the marble hall rises the full height of the house, 62 feet to the top of the dome, where it too is sky-lit through a glass oculus. Designed as a sculpture gallery, this circular room was completed in 1763. The decorative theme is based on the temples of the Roman Forum with more modern inventions: in the four massive, apse-like recesses are stoves disguised as pedestals for classical urns. The four sets of double doors giving entry to the room have heavy pediments supported by alabaster columns, and at second floor height, grisaille panels depict classical themes. From the saloon, the atmosphere of the 18th-century Grand Tour continues throughout the remainder of the principal reception rooms on the piano nobile, though on a slightly more modest scale. The "principal apartment", or State bedroom suite, contains fine furniture and paintings as does the drawing room with its huge Venetian window; the dining room, with its gigantic apse, has a ceiling that Adam based on the Palace of Augustus in the Farnese Gardens. The theme carries on through the library, music room, down the grand staircase (not completed until 1922) onto the ground floor and into the so called "Caesar's hall". On the departure of guests, it must sometimes have been a relief to vacate this temple of culture and retreat to the relatively simple comforts of the family pavilion. Also displayed in the house are many curiosities pertaining to Lord Curzon, Viceroy of India at the beginning of the 20th century, including his collection of Far Eastern artifacts. Also shown is Lady Curzon's Delhi Durbah Coronation dress of 1903. Designed by Worth of Paris, it was known as the peacock dress for the many precious and semi-precious stones sewn into its fabric. These have now been replaced by imitation stones; however, the effect is no less dazzling. In addition to that described above, this great country house contains collections of art, furniture and statuary. Kedleston Hall's alternative name, The Temple of the Arts, is truly justified.

Gardens and grounds The gardens and grounds, as they appear today are largely the concept of Robert Adam. Adam was asked by Nathaniel Curzon in 1758 to "take in hand the deer park and pleasure grounds". The landscape gardener William Emes had begun work at Kedleston in 1756, and he continued in Curzon's employ until 1760; however, it was Adam who was the guiding influence. It was during this period that the former gardens designed by Charles Bridgeman were swept away in favour of a more natural looking landscape. Bridgeman's canals and geometric ponds were metamorphosed into serpentine lakes. Adam designed numerous temples and follies, many of which were never built. Those that were include the North lodge which takes the form of a triumphal arch, the entrance lodges in the village, a bridge, cascade and the Fishing Room. The Fishing Room is one of the most noticeable of the parks buildings. In the neoclassical style it is sited on the edge of the upper lake and contains a cold bath and boat house below. Some of Adam's unexecuted design for follies in the park rivalled in grandeur the house itself. A "View Tower" designed in 1760 " 84 feet high and 50 feet wide on five floors, surmounted by a saucer dome flanked by the smaller domes of flanking towers " would have been a small neoclassical palace itself. Adam planned to transform even mundane utilitarian buildings into architectural wonders. A design for a pheasant house (a platform to provide a vantage point for the game shooting) became a domed temple, the roofs of its classical porticos providing the necessary platforms; this plan too was never completed. In the 1770s George Richardson designed the hexagonal summerhouse, and in 1800 the orangery. The Long Walk was laid out in 1760 and planted with flowering shrubs and ornamental trees. In 1763 it was reported that Lord Curzon had given his gardener a seed from rare and scarce Italian shrub, the "Rodo Dendrone" ( sic). The gardens and grounds today, over two hundred years later, remain mostly unaltered.